997722 has 24 divisors (see below), whose sum is σ = 2358720. Its totient is φ = 302280.

The previous prime is 997699. The next prime is 997727. The reversal of 997722 is 227799.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (997727) by changing a digit.

997722 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2322 + ... + 2717.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2⁹⁹⁷⁷²² is an apocalyptic number.

997722 is an abundant number, since it is smaller than the sum of its proper divisors (1360998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997722 is a wasteful number, since it uses less digits than its factorization.

997722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5058 (or 5055 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 997722 is about 998.8603505996. The cubic root of 997722 is about 99.9240089349.

It can be divided in two parts, 9977 and 22, that added together give a palindrome (9999).

The spelling of 997722 in words is "nine hundred ninety-seven thousand, seven hundred twenty-two".